Definition: You are given a question on conceptual physics. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: Heat comes from the Sun to Earth by the process of
(A)conduction (B)convection (C)radiation (D)All of these, although radiation is greatest

C